The HWIC-1DSU-T1 supports wetting current. Wetting current (or sealing current) is the minimum current needing to flow through electrical contacts in order to break through any contact oxidation that may have been deposited on the contacts. Central office sends 60 to 140 mA wetting current to prevent corrosion of electrical contacts in the card's network connection. Wetting current option may be enabled by a J2 jumper on the card. (default setting is "dry" configuration).